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<blockquote data-quote="raider" data-source="post: 77109" data-attributes="member: 353">listen to this... i used to be a spray foam contractor and have seen it go terribly wrong...i won't talk specs as it has been a couple years since i quit, and science never does... if you're going to go this route, carefully check the specs on the foam board and sealant... closed cell spray foam will give you a perm rating at under an inch... some builders like to use a hybrid system of spraying an inch of closed cell foam (r7), then putting up an r13 batt, then either a poly cover or not under the rock... either way, you have just built a petri dish as 2 coats of latex paint can be a vapor barrier... with this system, you don't have enough r value to stop the intrusion of cold air through the basement wall and the foam, the foam will b cold... when warm moist air travels through the inside wall and reaches the face of the foam, which is cold, when the dew point is reached in the wall you create condensation and start growing mold... in warmer climates to the south this will work... but up here it gets too cold... google &quot;flash and batt&quot;please, for the sake of your family, don't try to save a buck here... talk to reputable people you trust...if you can afford it - frame it, foam it - f it...</blockquote>

[QUOTE="raider, post: 77109, member: 353"] [COLOR=#ff0000][/COLOR] listen to this... i used to be a spray foam contractor and have seen it go terribly wrong... i won't talk specs as it has been a couple years since i quit, and science never does... if you're going to go this route, carefully check the specs on the foam board and sealant... closed cell spray foam will give you a perm rating at under an inch... some builders like to use a hybrid system of spraying an inch of closed cell foam (r7), then putting up an r13 batt, then either a poly cover or not under the rock... either way, you have just built a petri dish as 2 coats of latex paint can be a vapor barrier... with this system, you don't have enough r value to stop the intrusion of cold air through the basement wall and the foam, the foam will b cold... when warm moist air travels through the inside wall and reaches the face of the foam, which is cold, when the dew point is reached in the wall you create condensation and start growing mold... in warmer climates to the south this will work... but up here it gets too cold... google "flash and batt" please, for the sake of your family, don't try to save a buck here... talk to reputable people you trust... if you can afford it - frame it, foam it - f it... [/QUOTE]

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